Unmarked, by Kami Garcia

"Kennedy Waters and her companions find themselves in a world where vengeance spirits kill, ghosts keep secrets, and a demon walks the Earth. As they learn more about their ancient secret society, its longtime rivals the Illuminati, and Kennedy's mysterious family, they wonder whether Kennedy is really meant to be a member of the Legion"--

"Kennedy Waters and her companions find themselves in a world where vengeance spirits kill, ghosts keep secrets, and a demon walks the Earth. As they learn more about their ancient secret society, its longtime rivals the Illuminati, and Kennedy's mysterious family, they wonder whether Kennedy is really meant to be a member of the Legion"--

"Kennedy Waters and her companions find themselves in a world where vengeance spirits kill, ghosts keep secrets, and a demon walks the Earth. As they learn more about their ancient secret society, its longtime rivals the Illuminati, and Kennedy's mysterious family, they wonder whether Kennedy is really meant to be a member of the Legion"--